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Consolidated Statements of Comprehensive Income (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Net income $ 435,880us-gaap_ProfitLoss $ 241,353us-gaap_ProfitLoss $ 280,275us-gaap_ProfitLoss
Other comprehensive income:      
Change in unrealized gain on marketable securities 20,202us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax 6,773us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax 3,013us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
Change in unrealized (loss)/ gain on interest rate swaps (1,404)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax   450us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax
Change in foreign currency translation adjustment, net 96,895us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax (4,208)us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax 43,515us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax
Other comprehensive income 115,693us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent 2,565us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent 46,978us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
Comprehensive income 551,573us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest 243,918us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest 327,253us-gaap_ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest
Comprehensive income attributable to noncontrolling interests (17,468)us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest (6,436)us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest (19,702)us-gaap_ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest
Comprehensive income attributable to the Company 534,105us-gaap_ComprehensiveIncomeNetOfTax 237,482us-gaap_ComprehensiveIncomeNetOfTax 307,551us-gaap_ComprehensiveIncomeNetOfTax
Interest Rate Swap [Member]      
Other comprehensive income:      
Change in unrealized (loss)/ gain on interest rate swaps $ (1,404)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax
/ us-gaap_DerivativeByNatureAxis
= us-gaap_InterestRateSwapMember
  $ 450us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax
/ us-gaap_DerivativeByNatureAxis
= us-gaap_InterestRateSwapMember